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Resamples a sound file using a FIR filter

The resample program "resamples" a soundfile to change its sampling
rate. For example, it can be used to convert the sampling rate from
48 kHz (used by DAT machines) to 44.1 kHz (the standard sampling rate
for Compact Discs).

The windowfilter program designs Finite-Impulse-Response (FIR) digital
filters by the so-called "window method." In this method, the ideal
impulse response (a sinc function) is "windowed" by a Kaiser window (a
popular window used in spectrum analysis).